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C-3s, C-4s, C-5s Mineral Oil

  • Recommended by OEM’s for use with CFC’s and HCFC’s
  • Approved by OEM’s including Copeland, Carlyle, etc.
  • C-3s is approved replacement for 3GS


Nu-Calgon naphthenic mineral oil is available in three grades: C-3s (150 SUS), C-4s (300 SUS) and C-5s (500 SUS). All viscosities are manufactured by Calumet Lubricant Co. and are approved by Copeland, Trane and other compressor manufacturers, approvals varying by viscosity.

They are specifically designed for today’s high performance air conditioning and refrigeration compressors. These modern compressors run at higher speeds and generate higher temperatures, and they need better lubrication.

Use of C-3s, C-4s, and C-5s mineral oil will insure continued efficient system operation, providing the important properties required from a good refrigeration oil. Nu-Calgon mineral oils combine excellent solubility and stability with good floc and pour points to provide excellent low temperature performance.

Packaging Size Part Number Additional Info
1 gallon 4303-07 C-3s
5 gallons 4303-05 C-3s
55 gallons 4303-01 C-3s
1 gallon 4304-07 C-4s
5 gallons 4304-05 C-4s
55 gallons 4304-01 C-4s
1 gallon 4305-07 C-5s
55 gallons 4305-01 C-5s


This product must be used in accordance to the following directions by HVACR professionals only.

  • For Refrigerants 11, 12, 113 with evaporator temperatures above -20°F, use Nu-Calgon’s C-3s or C-4s Refrigeration Oils. Below -20°F, use only C-3s Refrigeration Oil.
  • For Refrigerants 13, 22, 114, 502, ethane, propane, and isobutane, use Nu-Calgon’s C-3s Refrigeration Oil.
  • For ammonia with evaporator temperatures above -20°F use Nu-Calgon’s C-4s or C-5s Refrigeration Oil. Below -20°F, use C-3s Refrigeration Oil.
  • When using “drop-in” refrigerants that call for a mineral oil, select one of the Nu-Calgon Refrigeration Oils in accordance with the appropriate viscosity required and evaporator temperatures.

Product Information:

Literature Downloads

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Product Safety

RTK Information

2611 Schuetz Rd. St. Louis, MO 63043
  • Telephone: 800.554.5499
  • Email:
  • Hours: Mon–Fri: 8:00am - 5:00pm (Central Time)

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